scientific article published on 13 July 2011

scientific article published in 1994

scientific article published in 1995

scientific article published in 1993

scientific article published in 1993

article published March 1994 in European Physical Journal C

scholarly article published December 1995

scientific article published in 1994

scientific article published in 1993

scientific article published in 1995

scientific article published in 1993

scientific article published in 1994